Headend for Distributed Antenna System and Operating Method Thereof

1. A head-end device comprising: a head-end control unit that receives a serial downlink signal transmitted from one of a plurality of base station interfaces; and a plurality of head-end transceivers that receive the serial downlink signal output from the head-end control unit, distribute the received serial downlink signal, and transmit the serial downlink signal in parallel to a remote device or an extension device, wherein one of the plurality of head-end transceivers receives the serial downlink signal and sequentially distributes the serial downlink signal to remaining head-end transceivers, wherein each of the plurality of head-end transceivers includes a plurality of sub head-end transceivers, and wherein one of the plurality of sub head-end transceivers receives the serial downlink signal, and distributes the serial downlink signal to at least one remaining sub head-end transceiver.

2. The head-end device of claim 1 , wherein the one of the plurality of head-end transceivers is an uppermost head-end transceiver from among the plurality of head-end transceivers.

3. The head-end device of claim 2 , wherein each of the plurality of head-end transceivers includes a distributor that distributes an upper head-end transceiver signal transmitted from an upper head-end transceiver from among the plurality of head-end transceivers to a signal to be transmitted to the remote device or the extension device and a signal to be transmitted to a lower head-end transceiver.

4. A head-end device comprising: a plurality of head-end transceivers that sequentially combine uplink signals received in parallel from each of remote devices or extension devices and output a combined serial uplink signal; and a head-end control unit that receives the combined serial uplink signal transmitted from one of the plurality of head-end transceivers and transmits the combined serial uplink signal to one of a plurality of base station interfaces, wherein each of the plurality of head-end transceivers includes a plurality of sub head-end transceivers, and wherein a lower sub head-end transceiver from among the plurality of sub head-end transceivers generates a combined signal by combining a signal transmitted from an upper sub head-end transceiver and an uplink signal directly received by the lower sub head-end transceiver, and outputs the combined signal.

5. The head-end device of claim 4 , wherein the one of the plurality of head-end transceivers is a lowermost head-end transceiver from among the plurality of head-end transceivers.

6. The head-end device of claim 5 , wherein each of the plurality of head-end transceivers includes a combiner that combines an upper head-end transceiver signal transmitted from an upper head-end transceiver from among the plurality of head-end transceivers and an uplink signal directly received by a corresponding head-end transceiver.

7. A method of operating a head-end device comprising: transmitting a serial downlink signal, in which all of downlink signals received by each of a plurality of base station interfaces are combined, to one of a plurality of head-end transceivers through a head-end control unit; receiving the serial downlink signal through the one of the plurality of head-end transceivers; and sequentially distributing the received serial downlink signal and transmitting the distributed serial downlink signals in parallel to a remote device or an extension device, wherein each of the plurality of head-end transceivers includes a plurality of sub head-end transceivers, and wherein one of the plurality of sub head-end transceivers receives the serial downlink signal, and distributes the serial downlink signal to at least one remaining sub head-end transceiver.

8. A method of operating a head-end device comprising: receiving uplink signals transmitted in parallel from each of remote devices or extension devices, through a plurality of head-end transceivers; sequentially combining the received uplink signals to generate a combined serial uplink signal; and transmitting the combined serial uplink signal to one of a plurality of base station interfaces through a head-end control unit, wherein each of the plurality of head-end transceivers includes a plurality of sub head-end transceivers, and wherein a lower sub head-end transceiver from among the plurality of sub head-end transceivers generates a combined signal by combining a signal transmitted from an upper sub head-end transceiver and an uplink signal directly received by the lower sub head-end transceiver, and outputs the combined signal.